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November 1998

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Subject:
From:
"Khaled H. Fouad" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 13 Nov 1998 01:35:28 +0200
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text/plain
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"Wolfe, Robert" wrote:
>
> Neckdown is a term used when a trace needs to be less wide in an area to get
> through pad/lands or just for pad entry because of solderability issues.
> I.E. say a conductor trace on a board is being routed at .025 wide and you
> need to get between two pads that have a .020 clearance between them you
> will need to neckdown the trace to say .008 wide. Or you are entering a .062
> pad with .10 trace and need to neckdown to say .040 close to the pad for
> solderability. Longwinded but basically making a trace less wide for a short
> distance to maintain design rule clearance or solderability.
> Robert M. Wolfe
>
Hi Robert
Why do you need to neckdown a trace when you enter a pad. Is this a DFA
vaiolation,plz explain ?
--
Best Regards
Khaled H. Fouad
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